Battery cell, battery, and electric apparatus

Abstract

This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes a housing and an electrode terminal. The housing includes a wall portion, where the wall portion is provided with an outlet hole. The electrode terminal is disposed at the outlet hole, where the electrode terminal is provided with a weak region, and the weak region is configured to be ruptured when an internal pressure of the housing exceeds a pressure threshold or a temperature exceeds a temperature threshold, allowing interior of the housing to communicate with exterior of the housing.

1 . A battery cell, characterized in that the battery cell comprises:
 a housing, wherein the housing comprises a wall portion, and the wall portion is provided with an outlet hole; and   an electrode terminal, wherein the electrode terminal is disposed at the outlet hole, the electrode terminal is provided with a weak region, the weak region is configured to be ruptured when an internal pressure of the housing exceeds a pressure threshold or a temperature exceeds a pressure threshold, allowing interior of the housing to communicate with exterior of the housing.   
     
     
         2 . The battery cell according to  claim 1 , characterized in that the electrode terminal is provided with an indentation slot, wherein the weak region forms a bottom of the indentation slot. 
     
     
         3 . The battery cell according to  claim 1 , characterized in that the electrode terminal comprises an insertion portion and a first flange portion connected to each other, wherein the insertion portion is inserted into the outlet hole along an axial direction of the electrode terminal, an outer circumferential surface of the first flange portion at least partially extends beyond an outer circumferential surface of the insertion portion in a radial direction of the electrode terminal, and a portion of the first flange portion disposed at a periphery of the outlet hole is supported on a side of the wall portion facing the interior of the housing, wherein the weak region is disposed on the insertion portion and/or the first flange portion. 
     
     
         4 . The battery cell according to  claim 3 , characterized in that the electrode terminal is provided with an indentation slot, wherein the weak region forms a bottom of the indentation slot, and the indentation slot is disposed on a side surface of the first flange portion facing and/or facing away from the wall portion. 
     
     
         5 . The battery cell according to  claim 4 , characterized in that the indentation slot is at least partially disposed opposite a matching gap between the outer circumferential surface of the insertion portion and a wall of the outlet hole along the axial direction. 
     
     
         6 . The battery cell according to  claim 5 , characterized in that a radial width of the matching gap is greater than a radial width of the indentation slot in the radial direction. 
     
     
         7 . The battery cell according to  claim 6 , characterized in that a projection of an outermost edge of the indentation slot in the radial direction along the axial direction falls within the matching gap. 
     
     
         8 . The battery cell according to  claim 3 , characterized in that the weak region is at least partially located on the outer circumferential surface of the insertion portion. 
     
     
         9 . The battery cell according to  claim 1 , characterized in that the electrode terminal comprises an insertion portion and a sealing portion connected to each other, wherein the insertion portion is inserted into the outlet hole along an axial direction of the electrode terminal, the insertion portion is disposed in a cylindrical shape, the sealing portion seals an end of the insertion portion facing the interior of the housing to form a recess portion, and the weak region is disposed on the sealing portion. 
     
     
         10 . The battery cell according to  claim 9 , characterized in that the sealing portion is welded to the insertion portion and forms a weld mark, wherein the weak region is located within the weld mark. 
     
     
         11 . The battery cell according to  claim 1 , characterized in that the weak region is disposed in a ring shape around a central axis of the outlet hole. 
     
     
         12 . The battery cell according to  claim 1 , characterized in that the electrode terminal comprises an insertion portion and a sealing portion connected to each other, wherein the insertion portion is inserted into the outlet hole along an axial direction of the electrode terminal, the insertion portion is disposed in a cylindrical shape, the sealing portion seals an end of the insertion portion facing the interior of the housing to form a recess portion, the battery cell comprises a sealing member, the sealing member is configured to seal the recess portion, and the battery cell is electrically connected to the outside through the sealing member. 
     
     
         13 . The battery cell according to  claim 12 , characterized in that the recess portion is configured to inject an electrolyte into the housing. 
     
     
         14 . The battery cell according to  claim 13 , characterized in that the sealing portion is provided with an electrolyte injection hole, wherein the electrolyte injection hole implements communication between the interior of the housing and the recess portion. 
     
     
         15 . The battery cell according to  claim 12 , characterized in that the battery cell further comprises a current collecting disc and an electrode assembly disposed inside the housing, wherein the current collecting disc is configured to connect a tab of the electrode assembly to the electrode terminal, and a side of the sealing portion facing away from the recess portion is welded to the current collecting disc. 
     
     
         16 . The battery cell according to  claim 1 , characterized in that the battery cell comprises an electrode assembly, wherein the housing comprises a shell and an end cover, one end of the shell has an opening, the end cover covers the opening, the shell comprises a side wall and an end wall, the side wall surrounds an outer side of the electrode assembly, the end wall is disposed opposite the opening, and the wall portion is the end cover or the end wall. 
     
     
         17 . The battery cell according to  claim 1 , characterized in that a melting point of a material of the electrode terminal is lower than a melting point of a material of the housing. 
     
     
         18 . The battery cell according to  claim 17 , characterized in that a difference between the melting point of the material of the housing and the melting point of the material of the electrode terminal is greater than 300° C. 
     
     
         19 . The battery cell according to  claim 1 , characterized in that a material of the housing comprises steel, and a material of the electrode terminal comprises aluminum or copper. 
     
     
         20 . A battery, characterized by comprising the battery cell according to  claim 1 .